The integrated circuit used in this detector is uncommon today. We found it in a documentation from the 70s. Detection is done by an optical camera with LEDs and a photo sensor.
This small power supply is suitable for powering devices using 9V batteries. The circuit uses...
Found in a 90s Silicon Chip documentation, this circuit provides a current of 3 A and the voltages...
This sensor triggers an oscillator emitting sound when a magnet is approached by a reed switch....